First slide

Doppler's effect

Question

A source emits a sound of frequency of 400 Hz, but the listener hears it to be 390 Hz. Then

Moderate

A

The listener is moving towards the source
B

The source is moving towards the listener
C

The listener is moving away from the source
D

The listener has a defective ear

Solution

Since apparent frequency is lesser than the actual frequency, hence the relative separation between source and listener should be increasing.

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